<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>没写好</title>
    <style>
        body{
            background-image: url("img/building.jpg");
            background-size:100%;
        }
        h1{
            font-size: 100px;
        }

    </style>
</head>
<body>
    <h1>正在施工。。。</h1>
</body>
</html>